Pekka and others,
-----Original Message-----
>> 4) 3GPP still needs to explain whether RA's are being used at all at the
>>moment -- that is, some have at least stated that e.g., addresses/prefixes
>>are configured as part of PDP context activation, which would seem to hint
>>at the fact that even if RA's would be possible, they might not be used that
>>much..
Usage of RA in 3GPP nw is no problem, i.e. it can be and is used. I can provide some
clarifying text on that in the 3GPP section. RA is a part of the 3GPP UE IPv6
addressing:
>From 3GPP TS 23.060, section 9.2.1.1:
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...
1) The MS sends an Activate PDP Context Request message to the SGSN as defined in
clause "PDP Context Activation Procedure". The MS shall leave PDP Address empty and
set PDP Type to IPv6.
2) Upon reception of the Create PDP Context Request, the GGSN creates an IPv6
address composed of the prefix allocated to the PDP context and an interface
identifier generated by the GGSN. This address is then returned in the PDP Address
information element in the Create PDP Context Response message. The processing of the
Create PDP Context Request and Create PDP Context Response, in both the SGSN and the
GGSN, is otherwise as specified in clause "PDP Context Activation Procedure".
NOTE: Since the MS is considered to be alone on its link towards the GGSN, the
interface identifier does not need to be unique across all PDP contexts on any APN.
3) The MS receives the IPv6 address produced by the GGSN in the Activate PDP
Context Accept. The MS extracts the interface identifier from the address received and
stores it. The MS shall use this interface identifier to build its link-local address
and may also use it for building its full IPv6 address, as describe in step 5. The MS
shall ignore the prefix contained in the address received in the Activate PDP Context
Accept. The processing of the Activate PDP Context Accept is otherwise as specified in
clause "PDP Context Activation Procedure".
4) The MS may send a Router Solicitation message to the GGSN to activate the
sending of the Router Advertisement message.
5) The GGSN sends a Router Advertisement message. The Router Advertisement
messages shall contain the same prefix as the one provided in step 2. A given prefix
shall not be advertised on more than one PDP context on a given APN, or set of APNs,
within the same addressing scope. The GGSN shall be configured to advertise only one
prefix per PDP context.
After the MS has received the Router Advertisement message, it constructs its
full IPv6 address by concatenating the interface identifier received in step 3, or a
locally generated interface identifier, and the prefix received in the Router
Advertisement. If the Router Advertisement contains more than one prefix option, the
MS shall only consider the first one and silently discard the others.
...
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Cheers,
-Juha-
.
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